ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
In this paper, coherent gradient sensing (CGS) and digital speckle correlation method(DSCM) are introduced to study the K-dominance of static crack tip in functionally gradientmaterials (FGMs) with a crack oriented along the direction of the elastic gradient. And thenumerical simulation is analyzed through finite element method (FEM). Firstly, the CGS andDSCM equations at the mode-I static crack tip of FGMs are developed, which can be used tocalculate the stress intensity factors of FGMs. Secondly, three kinds of FGMs specimens withdifferent variation of the modulus are prepared to observe the influences of the property variationon the K-dominance. Then three-point-bending experiments are carried out. The interference fringepictures of CGS and the speckle patterns for DSCM on the specimens are shot through the camera.Thirdly, based on the results of the experiments, the stress intensity factors of three kinds of FGMsspecimens are calculated by CGS and DSCM. Meanwhile, the stress intensity factors are obtainedby FEM. Finally, comparing the results from CGS, DSCM and FEM, the K-dominance of mode-Istatic crack tip in FGMs is discussed in detail. It is found that the K-dominance of FGMs andhomogenous material is almost same when the gradient index in FGMs is relatively small
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.348-349.789.pdf
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